Trip for die heads



Jan. 8,1929. 1,697,997

5. F. NEWMAN TRIP FOR DIE HEADS Filed Nov. 17, 1924 2 Sheets-Sheet i S. F. NEWMAN TRIP FOR DIE HEADS Jan. 8, 1929. 1,697,997

Filed Nov 17, 1924 Y 2 Sheets-Sheet 2 v gwvenkw Samuel F Newman Patented Jan. 8, 1929 SAMUEL Newman, or WAYNESBOBLG, PENNSYLVANIA, AssIenon TO'LANDIS MA- CHINE COMPANY, or wa nnsnose, rnnn's'rrivania, a conronrrrron or PENN- sYLvAnIA.

TRIP FOR DIE HEADS.

Application filed November 17, 1924-. Serial 1510. 750,477.

My said invention relates to trips for die heads and it is an object of the invention to provide means in connection particularly with die heads adapted to form threads on. pipe, bolts and the like for interrupt ng the threading operation after a thread has been cut on a predetermined length of the work.

A further object of the invention is to provide adjustable means in connection with the head whereby the length of the threaded portion may be varied.

Referring to the accompanying drawings, which are made a part hereof and on which similar reference characters indicate similar parts,

Figure 1- is a front elevation of my device inclosed position,

Figure 2, a similar view open position,

Figure 3, a section on line 33 of ure 1,

Figure 4, a section on line 4:& of Figure 2, and

Figure 5, ure 1. I

In the drawings reference character 10 indicates a head bodywhich is hollow as usual to permit lengthwise movement of the work part of the way through the body and the bore of which is enlarged at its rear end to accommodate a flange 11 on the shank Figa section on line 55 of Fig- 12, which flange closes the bore at the rear end to keep out'dirt from the rear portion of the bore and also to keep out dirt from the spaces between the body and a radial flange 13 on said shank, the latter flange terminating in a forwardly extending flan e 14.

T e forwardly extending flange 14 forms one element of a ring frame surrounding the head body, said ring frame comprising in addition to the flange 14 a series of rings'15, 16 and 17 (Fig. 3) of which the ring 16 is held rigidly against rotation relatively to theshank flange 14 by pins 23, hereinafter described.v The head body is held rigidly,

but adjustably, against such relative rotation by means of a screw (not shown) journaled in bearings in the rings 16 and engaging worm teeth at 18 on the body. The ring 17 is rotatably mounted on the body and is adapted to be oscillated in one direction to open position by resilient means not shown.

body. The ring 20 of the device in The ring 15 is clamped to the head body by a relatively thin ring 20 fitting about a reduced portionof thebody and securely held in place by means of screws 21 having threaded engagement with the body, the heads of said screws hearing at one side against a ledge on saidring and at the other side against countersunk portionsof the serves not only to clamp 15 to the body but also holds the rings 16 and 17 in place, a flange 22 at the front of the body cooperating with the ring for this purpose.

One or more pins 23 are secured to the flange 13, these pins passing through. holes in the r rotation relatively to the flange 13, thereby also holding the head body and the ring 15 in adjusted .positionrelative to said flange and shank. At their forward ends the pins have reduced portions engaging in recesses in the ring 17 suchrecesses being preferably provided with hardened bushings indicated at .24 and 25 respectively.

The frontface'of the head is provided with chaser holders 26 pivoted to the head body at-27 andconnected to thering 17 at 28 by sliding pin and slot connections.

the ring Each of the chaser holders has a clamping ing 16 and holding-the ring against engagement with the body of the chaser I holder. I r

The head body has parallel longitudinal bores adapted to receive trunnions 33 which in turn have threaded longitudinal bores 34 for the screws are: being understood that the trunnioiis mayibe integral with the chaser l holders or if not integral may oscillate with the chaser holders or independently thereof. Preferably the chaser holders are rigidly secured to thetrunnions or else integral therewith At therear ends of thetrunnions are threaded bores to receive screws 85 having flat heads. The bores are provided with shoulders 36 (preferably annular) and ina preferred construction the under face of the flat head of a screw bears against the annular shoulder 36at oneside and the adjacent flat end of the trunnion bears against the other parallel flat face of the shoulder 86. Set screws 37. are locatedin threaded openings in the fiat heads of the screws and bear against the adjacent faces of the trunnions thereby insuring against accidental lOOSeIllllg of the screws and providing means for holding the parts securely in place,the resulting absolute parallelism of the adjacent faces of the trunnion and the screw head being particularly advantageous in die heads where all parts should have rigid permanent positions while in operation as far as possible and where strict parallelism of the planes of movement of the cutter-holders and parts moving therewith is'highly essential.

The head body is hollow and the shank also has a longitudinal aperture of smaller diameter than the bore of the head body. A tripis located in these bores said trip being movable axially of the die head and comprising ahead 38 with longitudinal flanges. An annular flange 39 at the rear end of the head fits closely in the bore of the head body a cylindrical extension in the form of a rod 40 lies mainly in thebore of the shank. The

rod 40 is flattened at one side as shown in Figure 5 and a threaded plug 41 in said bore engages the threaded interior of the same,

' said plug contacting with the rear end of the rod whereby the trip may be adjusted lengthwise in the bore of the head body to predetermine the length of threads on the work in an adjustablemanner. A set screw 42 engages the rod 40 at its fiat side for locking the same against accidental movement. I

From the foregoing it will be understood that the head body can be rotatably adjusted relatively to thering16 and the shank for varying the diameter of the opening between the jaws in open and closed position rspec tively. The jaws can also be moved from open to closed position and back by rotation ot the ring 17 which maybe done by operating the handle 19 either manually or mechanically to close the head. This brings.

the chasers 31 into engagement with the work 43 whereupon a screw-thread is cut by the longitudinally adjustable tangential chasers 31 which are hardened bars that have had the thread contours milled in one side so asto permit end sharpening, that is, they are of the Landis type and this continues until the work strikes against the end of the trip as shown in Figure 4 whereupon the continued rotation of the head and the work relative to eachother draws the head body a and the rings 15, 16 and 1 7 forward relatively to the shank and the pins 23. When this operation has proceeded so far as to withdraw the reduced endsof the pins from the recesses in the ring 17 the resistance of the workto the action of the chasers 31 togetherwith the operation of resilient means not shown in the drawings throws the jaws Having thus fully described my said in vention, what I claim as new and desire to secure by Letters Patent, is: I

1. In a die head, av drilled shank, a hollow head body movable axially relatively to the shank, chasers on the head body, an oscilla tory ring for moving the chasers into and out oi operative position, one or more pins fixed relatively to the shankarranged to engage said oscillatory ring for holding the chasers in operative posit-ion said pins being wholly withdrawn from said ring by said axial movement to release" the chasers from the work and a trip carried by the head, said trip comprising a work contact head within the head body and a stem within the shank, j

means within the shank providing axial adjustment for the stem and a flange on the work contact head forming a sliding fit with the interior of the hollow head, so that axial stoppage of the-work by the trip enables the chasers to move the head body relative to the shank, substantially as set forth. v

2. In a die head, a head body, rings surrounding the body, an integral circumferential flange at the end of the body for holding the rings in place, a supporting shank for the body bearing against the rearmost ring, said shank movable axially relatively to said rm abdiit and secured to the body behind said first named rings for confining one of them against said shoulder andtrip'means movable axially within said body, substantially as set forth. I y

In witness whereof,I have hereunto set my hand at Waynesboro, 12th day of November, A. D. nineteen hundred and twenty-four.

a shoulder onflthe said body, a' ring Pennsylvania, this 7 

